def create_jointsofframebeamsRF
    model = Sketchup.active_model
    prompts = ["梁宽","梁高","截面跨长"]
    defaults = ["400","800","3000"]
    input = UI.inputbox(prompts, defaults, "创建梁支座截面")
    group = model.active_entities.add_group
        entities = group.entities
        

end